Perforating blade holding means



April 29, 1958 PERFORATING BLADE HOLDING MEANS Filed Dec. 13, 1954 INVENTORS A J. RICHARDS L. WIND/1 W OM United States Patent PERFORATING BLADE HOLDING MEANS Application December 13, 1954, Serial No. 474,932 6 Claims. (Cl. 16466) This invention relates to blade holding or mounting means and primarily such means for positioning a perforating blade with respect to a cylinder, such as is most useful in the printing art.

While many types of gripping or holding means have been availed of heretofore, so far as we are aware no one has provided for positioning the blade with great accuracy or adjusting the blade with respect to the axis of the cylinder on which the same is supported.

One of the primary advantages of this invention is that it reduces the probability of spoilage of cylinders which frequently result by reason of inaccurate initial machining of a blade receiving groove. In such cases heretofore, there was no possibility of using the cylinder where a blade groove was not precisely aligned with the axis of the cylinder or in any event another groove was necessary to be cut with the evident increased cost involved.

The present construction contemplates that a dovetail groove or recess is provided and by means of a pair of wedge-shaped members mounted therein which are movable toward and from one another, the blade there between maybe gripped and likewise adjusted if necessary so as to lie precisely in a radial plane coincident with the axis of the cylinder.

The desirability of such construction is particularly evident when it is pointed out that perforations in printing continuous forms for example, should be maintained at precisely right angles to the edges of the strip in which the perforations are being struck, in order that folding therealong will result in uniform stacking of substantial numbers of such forms.

In view of the foregoing it is therefore the principal object of this invention to provide means for mounting a perforating blade on a cylinder in a manner to maintain alignment thereof, effect quick adjustment, and enable rapid removal and replacement of such blade.

Other and further objects of the invention will be understood from a consideration of the specification appended hereto and shown in the drawing wherein:

Figure l is a plan view of a cylinder showing the general position of a blade for perforating therein, together with certain of the adjusting means provided therefore, the entire figure being substantially foreshortened and thus in some respect indicating an exaggerated relationship.

Figure 2 is an end view, partly in section taken about on the line 2-2 of Figure 1 looking in the direction of the arrows, further illustrating the location of the blade holding mechanism or means.

Figure 3 is an end view of the device shown in Figure 1, looking from the right hand end thereof.

Figure 4 is a view of a part of the blade adjusting mechanism or means.

Referring now to the drawing, Figure 1 illustrates a greatly foreshortened cylinder such as is customarily provided in a printing press or the like and denoted 1, the

same being preferably formed of a solid metal member having the ofistanding shaft members 2 and 3 at opposite ends, the same being axially aligned with the cylinder 1.

As illustrated in Figure 2 and also in Figure 3, there is provided in the periphery of the cylinder, a dovetail groove generally designated 4, having the inwardly sloping sides 5 and 6 and the bottom 7. As will be apparent from a consideration of both Figure 1 and likewise Figures 2 and 3, the groove or recess 4 is actually a spirally cut groove, which is thereby at an angle to the axis of the cylinder, the said axis being denoted 8.

Seated in the groove or recess 4 are the wedge shaped members 9 and 10, the said members being identical in most respects with the exception to be pointed out subsequently. Each of the wedge shaped .members 9 and 10 is formed so that it occupies substantially half of the volume of the recess 4, and the adjacent faces denoted '11 and 12 respectively are parallel and adapted to abut and grip therebetween the perforating blade denoted 13, the said blade 13 being formed of any suitable type of material such as hard steel and having a preferable type of edge such as a serrated edge thereof for carrying out the perforating function.

At each end of the cylinder there is provided an adjusting device generally denoted 14, which adjusting device in each case includes an adjusting bolt 15, provided at one end with a threaded section 16 adapted to engage and operate in a corresponding threaded section 17 of the corresponding wedge member 9 for example. The bolt member 15 is further provided with a pair of flanges, one designated 18 and the other 19 and a bearing section 20 therebetween. Further the bolt member 15 in each case is formed with a square head such as 21 for purposes of manipulation of the bolt member 15 as will be readily apparent.

The flange members 18 and 19 are adapted to engage opposite sides of a slotted sector member designated 22 I and shown particularly in Figure 4, the said member 22 including a U shaped slot or opening 23 therein and suitable .bolt openings 24 whereby the sector 22 may be fastened at the end near the periphery of the cylinder, the same being shown in its mounted position in Figure 3 as being fastened to the cylinder by means of suitable bolts 25. It will be understood that the sector 22 thus forms a part of a ring member 26 which is in turn bolted by means of suitable bolts 25 to the end of the cylinder in each instance.

One of the wedge members, in this case the wedge member 19, may be provided with suitable indicia indicated at 27, other indicia 28 being noted on the body of the surface of the cylinder, the same being provided for the purpose of positioning the blade member 13 in a manner now to be set forth.

Assuming that the parts are in the condition shown in Figure 1, it will be seen that the wedge member 9 and the wedge member 10 have been forced toward one another by suitable manipulation of the respective bolt members 15, to thereby grip and securely maintain the blade 13 therebetween. In order to be sure of accurate positioning of the blade 13 in a radial plane coincident with the axis 8 of the cylinder 1, the indicia 27 and 28 are provided to initially locate the wedge 10 in the condition shown in Figure 1. The wedge member 9 may be manipulated by means of the bolt 15 to cause the wedge to move into position and thus grip the blade 13 between the said wedges or wedge members. It will be further understood that adjustment is readily provided by the manipulation of the wedge members so that if for some reason the blade 13 is found to be perforating the web passing through the printing press for example at other than a right angle with respect to the edges of such web,

assaaii 3v suitable manipulation of the bolt members 15 may be resorted to, and thereby the blade 13 repositioned by manipulation of the bolt members 15.

border to adequately support the blade 13 for its perforating action, the bottom 7 of the recess 4 is preferably provided with a spring steel backing plate 29, the same extending throughout the groove or recess and being contacted at the lower edge by the blade 13 whereby impact ofthe blade will be distributed thereover and recess 4 will not be damaged during operative motion of the blade as will be readily apparent.

In view of the foregoing it will be readily understood that a novel means for maintaining the alignment of a perforating blade, effecting quick adjustment of the same and provide for simplified rapid removal and replacement of a blade should such be necessary.

We claim:

1. In blade holding means of the class described, in combination, a cylinder, a longitudinal recess in the periphery of said cylinder, said recess lying at an angle with respect to the axis of the cylinder, a blade member seated in the recess, longitudinally movable clamping devices in the recess abutting the blade member, said clamping de- Vices being formed so as to grip the blade therebetween by relative movement of said devices, and means to effect such movement.

2. In blade holding means of the class described, in combination, a cylinder, a longitudinal recess in the periphery of said cylinder, said recess being formed so as to lieat an angle with respect to the mtis of the cylinder,

means on the cylinder, movable longitudinally to maintain said blade in radially adjusted positions with respect to a plane passing through the axis of the cylinder, said means further providing for release and reengagement of said blade.

3. In blade holding means of the class described, in combination, a cylinder, a longitudinal recess in the pe riphery of the cylinder, said recess being spirally formed with respect to the axis of said cylinder, wedge-shaped gripping members seated in said recess, a blade between said members, and means at opposite ends of said cylinder 4 v to eifect movement of said gripping members toward and from one another to engageand maintain said blade in variously adjusted positions with respect to the axis of the cylinder.

4. In blade holding means of the class described, in combination, a cylinder, a spiral dovetail groove formed longitudinally in the periphery of the cylinder, a blade mounted in said recess and extending radially therefrom, gripping means at opposite sides of said blade engaging said sides and the sides of the groove, and adjustable devices on the cylinder connected to said gripping means to cause the same to clampingly contact the blade and rotatably adjustably position the same so as to lie in a radial plane passing through the axis of the cylinder.

5. in blade holding means of the class described, in combination, a cylinder rotatable about a central axis, a longitudinal spiral groove in the periphery thereof, a blade seated in said groove extending radially therefrom,- a pair of wedge-shaped members seated in'said groove, one at each side of the blade, and adjusting devices at opposite ends of the groove to compel movement of said members toward oneanother to grip the said blade therebetween.

6. The combination as claimed in claim 5, wherein the adjusting devices each comprise a bolt member threadedly engaged with its corresponding wedge-shaped member, a

pair of flanges being formed'in said bolt member, and a,

slotted element mounted on the end of the cylinder, said flanges engaging opposite sides of said element, and a head at the end of the bolt member for rotationthereof,

rotation of said bolt eflecting longitudinal movement of the wedge-shaped member engagedtherewith relative said bolt and cylinder. 7

References Cited in the-file of this patent 

